#include <stdio.h>  
  
int arr[6][32] = {1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63,  
                  2, 3, 6, 7, 10, 11, 14, 15, 18, 19, 22, 23, 26, 27, 30, 31, 34, 35, 38, 39, 42, 43, 46, 47, 50, 51, 54, 55, 58, 59, 62, 63,  
                  4, 5, 6, 7, 12, 13, 14, 15, 20, 21, 22, 23, 28, 29, 30, 31, 36, 37, 38, 39, 44, 45, 46, 47, 52, 53, 54, 55, 60, 61, 62, 63,  
                  8, 9, 10, 11, 12, 13, 14, 15, 24, 25, 26, 27, 28, 29, 30, 31, 40, 41, 42, 43, 44, 45, 46, 47, 56, 57, 58, 59, 60, 61, 62, 63,  
                  16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,  
                  32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63  
                 };  
int row[6], isRow[6];  
  
int main() {  
    int i = 0;  
    while (scanf("%d", &row[i]) && row[i] != 0) {  
        row[i]--;  
        isRow[row[i]] = 1;  
        i++;  
    }  
    int judge1 = 0, judge2 = 0;  
    for (int k = 0; k < 32; k++, judge1 = 0, judge2 = 0) {  
        int temp = arr[row[0]][k];  
        for (int j = 0; j < 6; j++)  
            for (int o = 0; o < 32; o++) {  
                if (temp == arr[j][o] && isRow[j] == 1)  
                    judge1++;  
                if (temp == arr[j][o] && isRow[j] == 0)  
                    judge2 = 1;  
            }  
        if (judge1 == i && judge2 == 0) {  
            printf("%d\n", arr[row[0]][k]);  
            break;  
        }  
    }  
    return 0;  
}  